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I have one in Wisconsin, and this last week has had a few exceptionally cold days. Those days, the heat pump doesn't go at all, but most days, it does.

Here's what the usage looks like over the past week:

Dark red is the furnace, light red is the heat pump. Green line is outdoor temperature, and you can see we've had some wild swings over the past week. Yellow line is the 71F inside temp. You can see that even on a 25F day (Dec 6), it was predominantly using the heat pump. That tends to be a fairly typical temperature in a Wisconsin winter most of the time.